#include "flash.h"
#include "lpc17xx_ssp.h"
#include "ssp.h"
#include "stdio.h"


uint16_t SPI_FLASH_TYPE=W25Q64;

SSP_DATA_SETUP_Type xferConfig;
//	uint8_t rxBuf;
//	uint8_t txBuf = 0xff;
//4Kbytes为一个Sector
//16个扇区为1个Block
//W25X16
//容量为2M字节,共有32个Block,512个Sector 


void SPI_FLASH_Start()
{
//	xferConfig.tx_data = &txBuf;
//	xferConfig.rx_data = &rxBuf;
//	xferConfig.length = 1;
//	SSP_ReadWrite(LPC_SSP0,&xferConfig,SSP_TRANSFER_POLLING);
}


//读取芯片ID W25X16的ID:0XEF14
uint16_t SPI_Flash_ReadID(void)
{
	uint16_t Temp = 0;	 
	uint8_t rxBuf; 		
	uint8_t txBuf[4]={W25X_ManufactDeviceID,0x00,0x00,0x00};
	
	SSP0_CS_Force(0);
	
	SSP0_ReadWriteByte(0x90);//发送读取ID命令	  
	SSP0_ReadWriteByte(0x00); 	    
	SSP0_ReadWriteByte(0x00); 	    
	SSP0_ReadWriteByte(0x00); 	 			   
	Temp|=SSP0_ReadWriteByte(0xFF)<<8;  
	Temp|=SSP0_ReadWriteByte(0xFF);	
	
	SSP0_CS_Force(1);
	
	return Temp;
}   

//SPI_FLASH写使能
//将WEL置位
void SPI_FLASH_Write_Enable(void)   
{          
	SSP0_CS_Force(0);
  SSP0_ReadWriteByte(W25X_WriteEnable);      //发送写禁止指令   	  
	SSP0_CS_Force(1);
} 


//SPI_FLASH写禁止	
//将WEL清零  
void SPI_FLASH_Write_Disable(void)   
{  
	SSP0_CS_Force(0);
  SSP0_ReadWriteByte(W25X_WriteDisable);    //发送写使能         
	SSP0_CS_Force(1);  
} 

//读取SPI_FLASH的状态寄存器
//BIT7  6   5   4   3   2   1   0
//SPR   RV  TB BP2 BP1 BP0 WEL BUSY
//SPR:默认0,状态寄存器保护位,配合WP使用
//TB,BP2,BP1,BP0:FLASH区域写保护设置
//WEL:写使能锁定
//BUSY:忙标记位(1,忙;0,空闲)
//默认:0x00
uint8_t SPI_Flash_ReadSR(void)   
{  
	uint8_t byte=0;   

	SSP0_CS_Force(0);
	SSP0_ReadWriteByte(W25X_ReadStatusReg);    //发送读取状态寄存器命令   
	byte=SSP0_ReadWriteByte(0Xff);             //读取一个字节  
	SSP0_CS_Force(1);	
	return byte;   
} 

//等待空闲
void SPI_Flash_Wait_Busy(void)   
{   
	while ((SPI_Flash_ReadSR()&0x01)==0x01);   // 等待BUSY位清空
}  

//擦除一个扇区
//Dst_Addr:扇区地址 0~511 for w25x16
//擦除一个扇区的时间约:10ms
void SPI_Flash_Erase_Sector(uint32_t Dst_Addr)   
{   
	Dst_Addr*=4096;
	
	SPI_FLASH_Write_Enable();           //SET WEL 	 
	SPI_Flash_Wait_Busy();   

	SSP0_CS_Force(0);
	SSP0_ReadWriteByte(W25X_SectorErase);      //发送扇区擦除指令 
	SSP0_ReadWriteByte((uint8_t)((Dst_Addr)>>16));  //发送24bit地址      
	SSP0_ReadWriteByte((uint8_t)((Dst_Addr)>>8));   
	SSP0_ReadWriteByte((uint8_t)Dst_Addr);  
	SSP0_CS_Force(1);
  SPI_Flash_Wait_Busy();   				    //等待擦除完成
}  

//读取SPI FLASH  
//在指定地址开始读取指定长度的数据
//pBuffer:数据存储区
//ReadAddr:开始读取的地址(24bit)
//NumByteToRead:要读取的字节数(最大65535)
void SPI_Flash_Read(uint8_t* pBuffer,uint32_t ReadAddr,uint16_t NumByteToRead)   
{ 
	uint16_t i;    												    
	SSP0_CS_Force(0);                         	//使能器件    
	SSP0_ReadWriteByte(W25X_ReadData);         	//发送读取命令    
	SSP0_ReadWriteByte((uint8_t)((ReadAddr)>>16));  //发送24bit地址    
	SSP0_ReadWriteByte((uint8_t)((ReadAddr)>>8));   
	SSP0_ReadWriteByte((uint8_t)ReadAddr);   
	for(i=0;i<NumByteToRead;i++)
	{ 
			pBuffer[i]=SSP0_ReadWriteByte(0XFF);   //循环读数   
	}
	SSP0_CS_Force(1);                           //取消片选   
}  

//SPI在一页(0~65535)内写入少于256个字节的数据
//在指定地址开始写入最大256字节的数据
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大256),该数不应该超过该页的剩余字节数!!!	 
void SPI_Flash_Write_Page(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)
{
	
	uint16_t i;  
	SPI_FLASH_Write_Enable();                  //SET WEL 
	SSP0_CS_Force(0);                           //使能器件   
	SSP0_ReadWriteByte(W25X_PageProgram);     //发送写页命令   
	SSP0_ReadWriteByte((uint8_t)((WriteAddr)>>16)); //发送24bit地址    
	SSP0_ReadWriteByte((uint8_t)((WriteAddr)>>8));   
	SSP0_ReadWriteByte((uint8_t)WriteAddr);   
	for(i=0;i<NumByteToWrite;i++)
		SSP0_ReadWriteByte(pBuffer[i]);//循环写数  
	SSP0_CS_Force(1);                         //取消片选 
	SPI_Flash_Wait_Busy();					   //等待写入结束
} 


//无检验写SPI FLASH 
//必须确保所写的地址范围内的数据全部为0XFF,否则在非0XFF处写入的数据将失败!
//具有自动换页功能 
//在指定地址开始写入指定长度的数据,但是要确保地址不越界!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)
//CHECK OK
void SPI_Flash_Write_NoCheck(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)   
{ 	
	uint16_t pageremain;	   
	pageremain=256-WriteAddr%256; //单页剩余的字节数		 	    
	if(NumByteToWrite<=pageremain)pageremain=NumByteToWrite;//不大于256个字节
	while(1)
	{	   
		SPI_Flash_Write_Page(pBuffer,WriteAddr,pageremain);
		if(NumByteToWrite==pageremain)break;//写入结束了
		else //NumByteToWrite>pageremain
		{
			pBuffer+=pageremain;
			WriteAddr+=pageremain;	

			NumByteToWrite-=pageremain;			  //减去已经写入了的字节数
			if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节
			else pageremain=NumByteToWrite; 	  //不够256个字节了
		}
	};

} 

//写SPI FLASH  
//在指定地址开始写入指定长度的数据
//该函数带擦除操作!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)	   
//uint8_t SPI_FLASH_BUF[4096];
void SPI_Flash_Write(uint8_t* pBuffer,uint32_t WriteAddr,uint16_t NumByteToWrite)   
{ 
	uint32_t secpos;
	uint16_t secoff;
	uint16_t secremain;	   
 	uint16_t i;    

	secpos=WriteAddr/4096;//扇区地址 0~511 for w25x16
	secoff=WriteAddr%4096;//在扇区内的偏移
	secremain=4096-secoff;//扇区剩余空间大小   

	if(NumByteToWrite<=secremain)secremain=NumByteToWrite;//不大于4096个字节
	while(1) 
	{	
//		SPI_Flash_Read(SPI_FLASH_BUF,secpos*4096,4096);//读出整个扇区的内容
//		for(i=0;i<secremain;i++)//校验数据
//		{
//			if(SPI_FLASH_BUF[secoff+i]!=0XFF)break;//需要擦除  	  
//		}
//		if(i<secremain)//需要擦除
//		{
//			SPI_Flash_Erase_Sector(secpos);//擦除这个扇区
//			for(i=0;i<secremain;i++)	   //复制
//			{
//				SPI_FLASH_BUF[i+secoff]=pBuffer[i];	  
//			}
//			SPI_Flash_Write_NoCheck(SPI_FLASH_BUF,secpos*4096,4096);//写入整个扇区  

//		}else SPI_Flash_Write_NoCheck(pBuffer,WriteAddr,secremain);//写已经擦除了的,直接写入扇区剩余区间. 

		SPI_Flash_Erase_Sector(secpos);//擦除这个扇区
		SPI_Flash_Write_NoCheck(pBuffer,WriteAddr,secremain);//直接写入扇区剩余区间
		
		if(NumByteToWrite==secremain)break;//写入结束了
		else//写入未结束
		{
			secpos++;//扇区地址增1
			secoff=0;//偏移位置为0  	 

		   	pBuffer+=secremain;  //指针偏移
			WriteAddr+=secremain;//写地址偏移	   
		   	NumByteToWrite-=secremain;				//字节数递减
			if(NumByteToWrite>4096)secremain=4096;	//下一个扇区还是写不完
			else secremain=NumByteToWrite;			//下一个扇区可以写完了
		}	 
	};	 	 
}



/**	@brief 在指定的扇区写入数据  
  * 
  * @param  	buf		写入的数据
	* @param		section	扇区号	0~2047
* @param		numBytetoWrite	数据长度 不超过4K
  * @note
  */
void SPIFlashSectionWrite(uint8_t* buf,uint16_t section, uint16_t numByteToWrite)
{
  //printf("sec:%d,num:%d",section,numByteToWrite);
	uint32_t writeAdd = (section * 4096);		//写入FLASH 中的地址
	SPI_Flash_Erase_Sector(section);//擦除这个扇区
	SPI_Flash_Write_NoCheck(buf,writeAdd,numByteToWrite);//写数据
}

/**	@brief 	在指定的扇区读取数据
  * 
  * @param  buf		读取的数据
	* @param		section	扇区号	0~2047
	* @param		numBytetoWrite	数据长度
  * @note
  */
void SPIFlashSectionRead(uint8_t* buf,uint16_t section, uint16_t numByteToRead)
{
	uint32_t readAddr = (section * 4096);		//写入FLASH 中的地址
	SPI_Flash_Read(buf,readAddr,numByteToRead); //读取数据  
}

